ZHCSPR0B april 2022 – august 2023 TPSI3052
PRODUCTION DATA
- 1
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Pin Configuration and Functions
-
6 Specifications
- 6.1 Absolute Maximum Ratings
- 6.2 ESD Ratings
- 6.3 Recommended Operating Conditions
- 6.4 Thermal Information
- 6.5 Power Ratings
- 6.6 Insulation Specifications
- 6.7 Safety-Related Certifications
- 6.8 Safety Limiting Values
- 6.9 Electrical Characteristics
- 6.10 Switching Characteristics
- 6.11 Insulation Characteristic Curves
- 6.12 Typical Characteristics
- 7 Parameter Measurement Information
- 8 Detailed Description
-
9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Application
- 9.2.1 Design Requirements
- 9.2.2
Detailed Design Procedure
- 9.2.2.1 Two-Wire or Three-Wire Mode Selection
- 9.2.2.2 Standard Enable, One-Shot Enable
- 9.2.2.3 CDIV1, CDIV2 Capacitance
- 9.2.2.4 RPXFR Selection
- 9.2.2.5 CVDDP Capacitance
- 9.2.2.6 Gate Driver Output Resistor
- 9.2.2.7 Start-up Time and Recovery Time
- 9.2.2.8 Supplying Auxiliary Current, IAUX From VDDM
- 9.2.2.9 VDDM Ripple Voltage
- 9.2.3 Application Curves
- 9.3 Power Supply Recommendations
- 9.4 Layout
- 10Device and Documentation Support
- 11Mechanical, Packaging, and Orderable Information
9.2.2.8 Supplying Auxiliary Current, IAUX From VDDM
The TPSI3052 is capable of providing power from VDDM to support external auxiliary circuitry as shown in Figure 9-10. In this case, the required transfer power must include the additional power consumed by the auxiliary circuitry on the VDDM rail. The RPXFR value must be set to meet the overall power requirements.
Figure 9-3 Supplying
Auxiliary Power From VDDMAs an example, assume that the auxiliary circuitry requires an average current of 4 mA. Table 9-4 summarizes the results from the TPSI3052 calculator tool. The Calculator tool can be found at Design Calculator.
| RPXFR, k? | Power Converter Duty Cycle, % | IVDDP, mA | PIN, mW | POUT, mW | IOUT, mA | tSTART, μs | tRECOVER, μs | fEN_MAX, kHz | IAUX_MAX, mA |
|---|---|---|---|---|---|---|---|---|---|
| 7.32 | 13.3 | 5.3 | 25.0 | 5.9 | 0.35 | N/A | N/A | N/A | N/A |
| 9.09 | 21.1 | 8.3 | 39.6 | 10.0 | 0.62 | N/A | N/A | N/A | N/A |
| 11 | 40.0 | 15.8 | 75.1 | 26.8 | 1.74 | N/A | N/A | N/A | N/A |
| 12.7 | 53.3 | 21.1 | 100.1 | 36.1 | 2.35 | 3557 | 96.0 | 10.4 | 4.1 |
| 14.7 | 66.7 | 26.4 | 125.2 | 45.5 | 2.98 | 2285 | 60.1 | 16.6 | 6.0 |
| 16.5 | 80.0 | 31.6 | 150.2 | 58.8 | 3.86 | 1549 | 39.3 | 25.5 | 8.6 |
| 20 | 93.3 | 36.9 | 175.2 | 68.8 | 4.52 | 1262 | 31.2 | 32.1 | 10.0 |
Based on the results in Table 9-4, several observations can be made:
- With RPXFR = 7.32 k? , RPXFR = 9.09 k?, and RPXFR = 11 k?, insufficient power is available to meet the application power needs specified in the design requirements in Table 9-1.
- With RPXFR = 12.7 k? and higher, sufficient power is transferred to meet the specified design requirements, however, for this design, RPXFR = 14.7 k? was selected for additional margin.
- For a given RPXFR, because a significant amount of the transferred power is being provided to the auxiliary circuitry, tSTART is longer, and fMAX reduced when compared to the results shown in Table 9-4 with IAUX = 0 mA.